1986. Circumcenters On Euler Line

1981. Euler To Euler

 

1977. Triangles With Same Centroid

1950. A Circle Centered At Incenter

1948. Gergonne-Nagel Conic

1947. A Conic Problem

1942. Right Triangles Inscribed In Feuerbach Hyperbola

1929. A Locus For K004-Darboux Cubic

1926. Triangles With Same Area

1920. A Line Perpendicular To Euler Line

1905. An Equilateral Triangle and X(14144)(Devoted to Turkish people died in Earthquakes)

1903. Triangles With Fixed Incenter(Devoted to Turkish people died in Earthquakes)

1902. Euler Line And Concyclic Points(Devoted to Turkish people died in Earthquakes)

1901. Collinear Nine-Point Centers

1886. Another Circle Tangent To Circumcircle at X(109)

1884. Circles Tangent To Circumcircle

1879. Perpendicular Lines

1877. A Property Of Rectangular Circumhyperbola

1852. Points On Circumcircle

1825. Another Myakishev Associate Triangles